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- coal (8)
- congresses (3)
- environmental aspects (3)
- coal gasification (2)
- coal liquefaction (2)
- coal mines and mining (2)
- combustion (2)
- desulphurization (2)
- pyrolysis (2)
- sulphur content (2)
- carbon sequestration (1)
- chlorine content (1)
- coal ash (1)
- coal-fired power plants (1)
- health aspects (1)
- law and legislation (1)
- oil gasification (1)
- 煤炭 (1)
- 煤矿 (1)
- 煤矿开采 (1)
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